I am not sure what to do about this, but I can try to give you a little bit of advice. I think that you should try to focus on your studies and get good grades. If you keep up with your studies, then you will be able to get into a good college or university.
To answer your question about what to do about your grades, I would say that you should focus on studying harder and making sure that you are prepared for your exams. If you need any help with your studies, you can always ask your teacher for help.